Jun
6
how fast does the bottom of a bicycle tyre travel if the cyclist is travelling forward at 10mph?
and how fast is the top of the tyre (tire) travelling?
The bottom of the tire is travelling at the same speed as the ground itself. (This must be so, else the tire would skid against the ground.)
That means that, relative to an observer sitting on the curb, the speed of the bottom of the tire is zero (same as the ground).
But relative to the CYCLIST, the speed of the bottom of the tire is 10 mph toward the rear (again, same as the ground).
Now, regarding the top of the tire: First look at it from the point of view of the cyclist. Since (as we established before) the tire’s bottom is travelling 10mph rearward, the tire’s top must be travelling 10mph forward. Again, this is relative to the cyclist.
Now look at it from the point of view of the observer on the curb. The cyclist is travelling 10mph forward relative to the observer; and the tire’s top is traveling 10mph forward relative to the cyclist. So the tire’s top relative to the observer is going 10mph forward + 10mph forward = 20mph forward.
Beading a stretched tyre or tire using a bicycle tube
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